AQA a level physics paper 2
1. Line of force <Ans> Direction a hypothetical "free north pole" would travel in the
field. Otherwise known as a field line.
2. Motor effect <Ans> Effect in which a current in a magnetic field experiences a force.
3. Fleming's left hand rule <Ans> Way of working out the directions involved in the
motor effect.
4. Magnetic flux density <Ans> Force per unit length per unit current on a conductor
perpendicular to the field lines. Often referred to as the strength of the magnetic field.
5. Couple <Ans> Pair of forces in opposite directions that try to turn an object. Acts on the
coil of a motor.
6. Thermionic <Ans> Property of a material that means that when it gets hot, it emits
electrons.
7. Cyclotron <Ans> Spiral particle accelerator.
8. Frequency <Ans> Number of rotations per second, given by 1/T.
9. Mass spectrometer <Ans> Device that separates a constituents of a substance by their
masses.
10. Ion <Ans> Charged atom.
11. Velocity selector <Ans> Component that uses an opposing electric and magnetic field
to ensure all particles going straight through have the same speed and direction.
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,12. Vacuum <Ans> Space where (nearly) all particles have been removed (evacuated).
13. Electromotive force <Ans> Force on electrons that tries to push them along. Known
as the emf.
14. Electromagnetic induction <Ans> Phenomenon in which a changing magnetic field,
relative to a wire, will produce an emf.
15. Fleming's right hand rule <Ans> Also known as the dynamo rule. Works out
direc- tions involved in electromagnetic induction.
16. Solenoid <Ans> Electrical coil.
17. Lenz's law <Ans> "The direction of the induced current is always such as to oppose
the change that caused the current".
18. Magnetic flux <Ans> Product of the magnetic flux density and the area.
19. Magnetic flux linkage <Ans> Product of the magnetic flux and the number of turns of
the coil.
20. Faraday's law <Ans> "The induced emf in a circuit is equal to the rate of change of
flux linkage through the circuit".
21. Alternator <Ans> Generator of AC.
22. Back emf <Ans> An emf generated in a motor that works against the current that is
powering the motor.
23. Step-up <Ans> Transformer that raises the voltage and lowers the current (answer is
2/
17
, hyphenated!)
3/
17
1. Line of force <Ans> Direction a hypothetical "free north pole" would travel in the
field. Otherwise known as a field line.
2. Motor effect <Ans> Effect in which a current in a magnetic field experiences a force.
3. Fleming's left hand rule <Ans> Way of working out the directions involved in the
motor effect.
4. Magnetic flux density <Ans> Force per unit length per unit current on a conductor
perpendicular to the field lines. Often referred to as the strength of the magnetic field.
5. Couple <Ans> Pair of forces in opposite directions that try to turn an object. Acts on the
coil of a motor.
6. Thermionic <Ans> Property of a material that means that when it gets hot, it emits
electrons.
7. Cyclotron <Ans> Spiral particle accelerator.
8. Frequency <Ans> Number of rotations per second, given by 1/T.
9. Mass spectrometer <Ans> Device that separates a constituents of a substance by their
masses.
10. Ion <Ans> Charged atom.
11. Velocity selector <Ans> Component that uses an opposing electric and magnetic field
to ensure all particles going straight through have the same speed and direction.
1/
17
,12. Vacuum <Ans> Space where (nearly) all particles have been removed (evacuated).
13. Electromotive force <Ans> Force on electrons that tries to push them along. Known
as the emf.
14. Electromagnetic induction <Ans> Phenomenon in which a changing magnetic field,
relative to a wire, will produce an emf.
15. Fleming's right hand rule <Ans> Also known as the dynamo rule. Works out
direc- tions involved in electromagnetic induction.
16. Solenoid <Ans> Electrical coil.
17. Lenz's law <Ans> "The direction of the induced current is always such as to oppose
the change that caused the current".
18. Magnetic flux <Ans> Product of the magnetic flux density and the area.
19. Magnetic flux linkage <Ans> Product of the magnetic flux and the number of turns of
the coil.
20. Faraday's law <Ans> "The induced emf in a circuit is equal to the rate of change of
flux linkage through the circuit".
21. Alternator <Ans> Generator of AC.
22. Back emf <Ans> An emf generated in a motor that works against the current that is
powering the motor.
23. Step-up <Ans> Transformer that raises the voltage and lowers the current (answer is
2/
17
, hyphenated!)
3/
17
